It's more complicated than that IMO.
Wenger has strengths and weaknesses, like anyone.
In the best years under Wenger his strengths propelled us to heights I never thought I'd see an Arsenal side achieve but even then his weaknesses showed, looking back - failure in Europe with one of the great club sides of all time (IMO) and a failure to retain the title. After The Invincibles the stadium move did hamper us, you can't blame Wenger for that especially as it coincided with the billionaires coming into the game. In that era I think, overall, he did well to keep us relatively competitive but he did fail to land us trophies on a few occasions when he should have done. When the new financial deals came in I think he deserved a chance to use the money. Players like Ozil and Sanchez should have pushed us on, the FA Cups were a good start but we have failed to push on for bigger prizes and it's clear we won't under Wenger. So while I think we pretty much all agree Wenger should go, I don't agree that we would have fared better had he been replaced 10 years ago. Obviously we'll never know, but any other manager would have been subject to financial constraints and I don't think many would have done significantly better.
Your post is exactly what Wenger tells himself every night before having a blissful sleep.